JPH06340370A - Calender controller - Google Patents

Abstract

PURPOSE:To make feedback control of over nip pressure for keeping the extent of paper thickness constant at all times performable at the side of a device in an automatic manner by comparing an actual paper thickness value with the paper thickness set value, imparting a compensation command of the nip pressure according to a deviation, and performing a fine adjustment of this nip pressure. CONSTITUTION:A finished product being delivered out of a calender roll 2 is continuously wound up by a wind roll 5. Paper thickness of this finished product to be rolled on this wind roll 5 is detected by a paper thickness detecting means 7. A nip pressure compensating means 9 compares the detected actual paper thickness value with the paper thickness set value to be set by a paper thickness setting means 8, imparting a compensating command of nip pressure to a nip pressure adjusting means 3 according to the deviation. In succession, this nip pressure adjusting means 3 is made so as to do its fine adjustment of the nip pressure, whereby nip pressure control for keeping the paper thickness constant at all times is automatically performed at the side of a device. With this operation, the paper thickness is accurately adjustable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calendar device,
Particularly, it relates to a calendar control device capable of automatically correcting the paper thickness of a finished product.

[0002]

2. Description of the Related Art Conventionally, in a calendar control device, a calendar portion for polishing the surface of a paper finished as a final step of manufacturing a paper product and performing a treatment for making the surface glossy,
The winder section for continuously winding the finished product fed from the calendar section had the configuration shown in FIG. That is, the calender unit 2 calender rolls the calender roll 2 with a certain pressure applied to the paper 1 as a product, and the nip pressure setting device 3 that sets the nip pressure to the calender roll 2.
And an electro-pneumatic converter 4 that generates a pressure according to the pressure standard set by the nip pressure setting device 3, and the winder unit continuously winds the calender-processed finished product and a winder roll 5 and this winder. The winding diameter calculation device 5 calculates a winding diameter in order to control the surface speed of the paper 1 wound around the roll 5 to a constant value, and controls the rotation speed of the winder shaft according to the calculated winding diameter and speed setting. I was trying to do.

[0003]

However, in such a conventional calendar control device, the paper feeding is performed so that the paper being processed is not broken or the rolled product is wrinkled in the actual operating state. The nip pressure setting device 3 was finely adjusted by the operator's hand depending on the state to manage the finish of the product, but there was almost no index for this fine adjustment of the nip pressure, and the operator's intuition was taken. The operator makes an overall judgment based on the state of the product and the state of feeding the paper to make the adjustment. Therefore, there is a problem in that the objective judgment criteria are poor and the operator is required to have a certain degree of proficiency.

Further, since the open loop control is performed, the operator must constantly finely adjust the nip pressure setting device while always watching the winding state of the paper.
There was a problem that the labor burden and mental burden were large.

The present invention has been made in view of such conventional problems, and the paper thickness is automatically detected, and the nip pressure is automatically adjusted based on the automatically detected paper thickness, so that the paper thickness is accurately adjusted. It is an object of the present invention to provide a calendar control device that can be adjusted, does not require the operator to have a high degree of skill, and can reduce labor and mental burdens.

[0006]

The calendar control device of the present invention detects the paper thickness of the rolled product provided in the winder section for continuously winding the finished product delivered from the calendar roll by the winder roll. Paper thickness detecting means, nip pressure adjusting means for adjusting the paper thickness of the finished product by adjusting the nip pressure of the calendar roll, paper thickness setting means for setting the paper thickness of the finished product,
The actual paper thickness value output by the paper thickness detecting means is compared with the paper thickness setting value set by the paper thickness setting means, and a nip pressure correction command is issued to the nip pressure adjusting means so as to obtain an appropriate nip pressure according to the deviation. And a nip pressure correcting means for giving

[0007]

In the calendar control device of the present invention, the paper thickness of the finished product wound on the winder roll of the winder section is detected by the paper thickness detecting means, and the nip pressure correcting means sets the detected actual paper thickness value. Compared with the paper thickness setting value set by the means, the nip pressure adjustment command is given to the nip pressure adjustment means according to the deviation so that the nip pressure adjustment means finely adjusts the nip pressure to keep the paper thickness constant. The nip pressure control is automatically performed on the device side.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a circuit block diagram of an embodiment of the present invention, in which a calendar section 2 is a calendar roll 2 which feeds out a paper 1 which is a product with a certain pressure, and the calendar roll 2.
A nip pressure setting device 3 for setting the nip pressure and an electropneumatic converter 4 for generating a pressure according to the pressure reference set by the nip pressure setting device 3. In addition, the winder unit continuously winds the calendered finished product, a one-ider roll 5, a winding diameter calculation device 6 for calculating the winding diameter of the paper 1 wound on the winder roll 5, and the winding diameter. A paper thickness calculating device 7 for calculating the actual paper thickness from the change rate of the winding diameter calculated by the calculating device 6, a paper thickness setting device 8 for giving a paper thickness setting value, an actual paper thickness and a paper thickness setting value, and And a nip pressure correction device 9 which calculates a necessary fine adjustment value of the nip pressure according to the deviation and gives it to the nip pressure setting device 3.

Next, the operation of the calendar control device having the above configuration will be described. First, the nip pressure of the calendar roll 2 is set by the nip pressure setting device 3 so that a finished product having a desired paper thickness is obtained, and the desired paper thickness is set by the paper thickness setting device 8. In order to apply the nip pressure set by the nip pressure setting device 3, the electropneumatic converter 4 converts the electric signal from the nip pressure setting device 3 into the corresponding air pressure, and applies the predetermined nip pressure to the calendar roll 2. . Then, when the paper 1 fed into the calendar roll 2 passes through the calendar roll 2, the surface is polished while being pressed by the roll, and the polished paper 1 is continuously wound around the winder roll 5 as a final product. Will be taken.

Since the paper thickness of the paper 1 wound up on the winder roll 5 in this way should be slightly smaller than the paper thickness before entering it because the surface is polished by the calendar roll 2, the winder should be slightly thinner. The nip pressure is finely adjusted so that the paper thickness of the paper 1 wound on the roll 5 becomes regular.

For that purpose, first, the winding diameter of the winder roll 5 is always calculated by the winding diameter calculating device 6 in order to control the surface speed of the paper 1. Therefore, the paper thickness calculating device 7 calculates the paper thickness from the time change of the winding diameter calculated by the winding diameter calculating device 6 based on the following formula.

[0012]

[Equation 1] Here, h: paper thickness δD: change in winding diameter per n rotations n: number of rotations.

For example, if the winding diameter changes by 0.8 mm (δD) while the shaft of the winder roll 5 makes four revolutions (n), the paper thickness h becomes 0.1 mm.

In the nip pressure correction device 9, the deviation between the paper thickness h thus obtained by the paper thickness calculation device 7 and the paper thickness setting value set by the paper thickness setting device 8 is inputted, and the nip pressure of the calendar roll 2 is inputted. Determine whether is appropriate. That is, if there is a deviation, the correction value necessary for finely adjusting the nip pressure is output to the nip pressure setting device 3.

As a result, the added value of the nip pressure setting value from the nip pressure setting device 3 and the correction value from the correction device 9 is input to the electropneumatic converter 4, and the electropneumatic converter 4 is supplied with the electrical value. The air pressure corresponding to the magnitude of the signal is applied to the calendar roll 2.

Thus, in the calendar control device of this embodiment, the paper thickness of the paper 1 wound on the one-ider roll 5 is automatically calculated and compared with the paper thickness set value, and the nip pressure is adjusted according to the deviation. With automatic adjustment, feedback control can be performed so that the paper thickness of the final product will always be a constant value, and a product with a stable paper thickness can be taken out without fine adjustment of the nip pressure by the operator's hand. become able to.

[0017]

As described above, according to the present invention, the paper thickness of the finished product wound on the winder roll of the winder section is detected by the paper thickness detecting means, and the nip pressure correcting means detects the actual paper thickness value. Is compared with the paper thickness setting value set by the paper thickness setting means, and a correction command for the nip pressure is given to the nip pressure adjusting means according to the deviation so that the nip pressure adjusting means performs fine adjustment of the nip pressure. Feedback control of the nip pressure to always keep the paper thickness constant can be automatically performed on the device side, and accurate control of the paper thickness is automatically performed without the operator manually adjusting the nip pressure. It is possible to reduce the burden on the operator.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a conventional example.

[Explanation of symbols]

 1 Paper 2 Calendar Roll 3 Nip Pressure Setting Device 4 Electro-Pneumatic Converter 5 Winder Roll 6 Winding Diameter Calculator 7 Paper Thickness Calculator 8 Paper Thickness Setting Device 9 Correction Device

Claims (1)

[Claims] 1. A paper thickness detecting means for detecting a paper thickness of a rolled product provided in a winder section for continuously winding a finished product fed from a calendar roll by a winder roll, and a nip pressure of the calendar roll. Nip pressure adjusting means for adjusting the paper thickness of the finished product by adjusting, paper thickness setting means for setting the paper thickness of the finished product, and actual paper thickness value and paper thickness setting means output by the paper thickness detecting means. And a paper thickness setting value set by, and a nip pressure correcting means for giving a nip pressure correction command to the nip pressure adjusting means so as to obtain an appropriate nip pressure according to the deviation.